mirror of
https://github.com/eddyem/stm32samples.git
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123 lines
3.9 KiB
C
123 lines
3.9 KiB
C
/*
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* This file is part of the usart project.
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* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stm32g0.h>
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#include "flash.h"
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#include "strfunc.h"
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#include "usart.h"
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// KEY (intpullup->0) - PC0
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// LED - PC8
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volatile uint32_t Tms = 0;
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/* Called when systick fires */
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void sys_tick_handler(void){
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++Tms;
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}
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static void gpio_setup(void){
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RCC->IOPENR |= RCC_IOPENR_GPIOCEN; // enable PC
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// set PC8 as opendrain output, PC0 is pullup input, other as default (AIN)
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GPIOC->MODER = (0xffffffff & ~(GPIO_MODER_MODE8 | GPIO_MODER_MODE0)) | GPIO_MODER_MODER8_O;
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GPIOC->PUPDR = GPIO_PUPDR0_PU; // pullup
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GPIOC->OTYPER = GPIO_OTYPER_OT8; // open drain
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}
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static const char *helpmsg =
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"'1' - change U16 value\n"
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"'2' - change U32 value\n"
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"'d' - dumpconf\n"
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"'e' - erase flash\n"
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"'f' - save conf to flash\n"
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"'s' - change string (up to 31 symbol)\n"
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"'t' - print Tms\n"
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;
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static void chstr(const char *s){
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int i = 0;
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for(; i < 31 && *s; ++i){
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the_conf.str[i] = *s++;
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}
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the_conf.str[i] = 0;
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}
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int main(void){
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StartHSE();
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SysTick_Config(8000); // 1ms counter
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flashstorage_init();
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gpio_setup();
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usart3_setup();
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uint32_t T = 0;
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int sent = 0;
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/* Do nothing in main loop */
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while (1){
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if(Tms - T > 499){ // blink LED
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T = Tms;
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pin_toggle(GPIOC, 1<<8);
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usart3_sendbuf();
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}
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if(pin_read(GPIOC, 1<<0) == 0){ // key pressed - send data over USART
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if(!sent){
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usart3_sendstr("Button pressed\n");
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sent = 1;
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}
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}else sent = 0;
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int wasbo = 0;
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char *rcv = usart3_getline(&wasbo);
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if(wasbo) usart3_sendstr("Buffer overflow occured @ last message\n");
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if(rcv){
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char cmd = *rcv++;
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uint32_t U, got = 0;
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const char *n = getnum(rcv, &U);
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if(n != rcv) got = 1;
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switch(cmd){
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case '1':
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if(!got || U > 0xffff) SEND("Need an uint16_t number\n");
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else the_conf.flagU16 = (uint16_t)U;
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SEND("Changed to "); printuhex(the_conf.flagU16); newline();
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break;
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case '2':
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if(!got) SEND("Need an uint32_t number\n");
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else the_conf.flagU32 = U;
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SEND("Changed to "); printuhex(the_conf.flagU32); newline();
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break;
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case 'd':
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dump_userconf();
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break;
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case 'e':
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if(erase_storage()) SEND("Error erasing\n");
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else SEND("Erased OK\n");
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break;
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case 'f':
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if(store_userconf()) SEND("Error: can't save\n");
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else SEND("OK, stored\n");
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break;
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case 's':
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chstr(omit_spaces(rcv));
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SEND("Changed to: "); SEND(the_conf.str); newline();
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break;
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case 't':
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SEND("Tms="); printu(Tms); newline();
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break;
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default: SEND(helpmsg);
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}
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}
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}
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}
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